Portable power plant utilizing steam at different pressures



y 1,635,548. July '12 1927 o. H. HAR'QMANN ET AL PORTABLE POWER PLAINT UTTLZING STEAM AT DIFFERENT PRESSURS- WITNESS ATTRNEYS Patented July l2, 1927i# 1 erro. HARTMANNAND FRIEDRICHWEMPE;on"cAssErl-WILHsLivrsnonE, esta MANY, Assienons iro sciiviinrfsoiin nnissnnivirr e. ivi. n.111.; ononssun-WIL-V HnLMsHoHE, GERMANYQA conroaafrron or' GERMANY.

PORTABLE acumen PLANTuTILIZInG srEAivra'r. DIFFERENT rianssiiaas' y i Appiicatin med Mayra, ia'agseriai 110.2754673 aria iii Germany may' ragusa;` A

Portable steam poiver' plants, andparticularly loconiotives,. generally include auxiliaries such as feed `Water pumps andllair pumps. in plants operating' ivithjdiffereiit boilerpressuresof steam (compound system and tlie'like) the power requirements of such auxiliaries are greater than in plantsusing only one boiler pressure, chiefly 'ifo-r the reason that each portion of the plant Which op'- 'erates at a'boiler pressure diiilerent from the other portions, requires a separate feed' Water pump. Thus, with the drive employed hitherto for the auxiliaries'under such *pressure conditions, Vthe gains obtained by the use ottivoor more pressures, are reduced coiisiderablyby the increased ments of the auxiliaries. f y

' According to 'ouriiiventiom theV steam for' operating the auxiliaries is taken irom thev high-pressure portion of the steam-generating plant,rand the exhaust'from these auxiliaries is conveyed -to the low pressure portion oft the poWer'plant, either to theloivpressure portion of the engine, or to the low- Vpressuresteam generator.

By this invention, ive secure a system of Ihigh thermic eiciency for driving the aux-V iliaries of power plants employing steam at two or more vpressures simultaneously. The

heat contained in the steam is utilized to the extent of almost 100%, since the heat still contained in the exhaust ot the auxiliaries is trans'lerred,'with but insignificant losses, to the low-pressure portion of the steam ypower plant, The heat losses are due exclusively to radiation and to mechanical fric- The invention .is of especial advantage ivhen applied to locomotives of the type comprising a fire box constructed-as a boiler for the generation of high-pressure steam (say about atmospheres or more) and a longitudinal boiler for generating steam of (a lower pressure, say thecustomary pressure of'about l5 atmospheres. y

In the practical carrying out of our invention, We may, during theoperation of the main'engine, convey theexhaust of the aux: iliaries either to the low-pressure lstage or stages of thema-in engine, or to the low-pressureboiler. In the latter case We place an .oilvseparator in the connection leadingffrom A therespective auxiliary tothe 10W-pressureK4 boiler so as` to keep I the lubricating oil from power require-.-

box in the usual manner. l have indicated the feed Water pumps for the high-p`ressure boiler. and the' lowpressi'ire reaching such boiler. Atfsuch times as theexhaust from the auxiliaryled directly to .the low-pressure portion or' the main engine, t

thisoil separatoris put outer' action, bytl'ic Well-known or approved manner. y Another advantagelof the `p resent invencustomary the boilers.v

A satisfactory example of ourinvention is illustrated "by the... accompanying' draW-.

ings, in `uf'l'iicha power plant' fon av steamv locomotive is'shoivn in diagrammatic side K- .elevationfin"Fig. l," While .Fig.` 2.is .'.a diagrammatic en d view.-

1 The boilerfis represented as? having ltivo separate `portions in which steam of high,

and low pressures'respectively"is generated.l t ln theiire-box a, constructedas an independent Water-tubeV boiler, 'We produce steam of a pressure of say 60 atmospheres. This steam.. is taken -toone 0r more 'collectors 'fb locatedY above the lire-box, and is then conveyed by-` v pipes c to the slidevalves d2 of the'high-H S0 In the `longitudipressure Vcylinders Z ol the main engine driving .the locomotive.

nal boiler 0, here shoWiiasa smoke iluevl :V

boiler, We produce steam of .a lower pressure, say l5 atmospheres, andl this steam is l 'conveyed by pipes e to the slide valves. CZ?

of the low-'pressure'cylinders or stages rlV of the mainengine. AtV d4' Wey have indicated a pipe connecting thehigh-pressure cylinder I With the'corresponding low-pressure cylint-v,

der; this pipe also serves as arreceiver. A pipe d5' leads the4 exhaust of the loWspressure cylinder to theblast pipe inthe smoke At f and f We boilerrespectively, *and at g the airpump.

The steam for operating these auxiliaries/f,

and, is taken from the hi hressure steam collector b. Thus, a branch pipe h may" lead from' one of the pipes-c t'o the airfpump g, While from the saine pipe c a branch pipe z' leads to both feed'rwater pumps 7v and f.

The distribution of the steam to these tvvor pumps is etected by a regulator 7c of any appropriate.'construction. i

The exhaust steam from these auxiliaries maybe conveyed tothe loW-pressure stage of n.

the `maingengine, or to theyreceiver o-said.

y iliaries, instead of passing to the boiler, isV oonveypedto the low-pressure portion of the ,inainenginej 25 stage, or the loW-pressure'boiler e. a example illustrated, it has beenr 'water pumps f, f *pipe* m common to them, ,sure portions of the main engines. `This, ar-

niet' In the that the exhaust steam from vthe feed is conveyed, through a to the low-presraiigement is desirable, as arrule, since the yfeed water pumps are operated only While .the locomotive is under Way. On the other hand, theair pump is vgenerally operated only When-the locomotive is standing still.v 'llhusethe exhaust steam off the air pump is vconveyed tothe lovv pressure boiler e. In

orderV to prevent the oil lcontained in this Vsteam from reaching the boiler e, an oil separator V4o has` been placed in the exhaust steam pipe n leading from the air pump g toA the said: boiler. AY selecting arrangement (suchas a three-Way cock 0") might also he provided for putting the oil separator out of operation vvhen the exhaust Yfrom the auX- k This will improve the lulori cation of .such low-pressure portion.v Vari,- ous modifications may he made Without Vde Yparting from the'nature of ourv invention as Y set. forth 'inl the appended claims.

1 vWfe claim:

1'. A locomotive comprising sure steam generator, a low-pressureV steam generator, a1 main engine having tivo stages receiving steam from. said generators respectively, anair pumpaiid an engine there.-

assumed e a high-presfor, a conduit leading from said high-pres-f sure generator to the *airr pump engine, a Conduit leading exhaust steamrfrom Asaid air pump engine'to said 10W-pressure steam generator', a connection" from ther air pump engine to the low-pressure stage ofthe main engine, and a selecting arrangementfor per` yn'iitting exhaust steam from the air pump .engine to pass either to the `10W pressure steam generatorA or tothe low-pressure stage of the engine.

,2. A, locomotivecomprising a high-presfsure'steain generator, a low-,pressure steam low-pre ure stage of the Amain engine, a con-- nection from the air pump engine to the low-pressure stage of the main engine, anda selector for permitting exhaust steamr from .such air pump engine to pass either to the low-pressure steamgenerator or to the 10W- pressurestage of the mam engine.

In testimony whereof We have hereunto set? our hands.

TTO HARTMANN.

FRIEDRICH WEMPE. 

